Why Buying Berkshire Hathaway Was Warren Buffett’s Biggest Mistake
Warren Buffett is approaching the end of one of the most extraordinary careers in business history. After nearly six decades at the helm of Berkshire Hathaway, the legendary investor is entering his final week as CEO of the company that made him a household name and one of the richest people on the planet.
Since taking control of Berkshire in 1965, Buffett turned a struggling textile manufacturer into a $1 trillion conglomerate, owning everything from insurance and railroads to energy companies and household brands. His success reshaped modern investing and inspired generations of shareholders.
Yet despite all of that, Buffett has repeatedly said something that sounds almost impossible: buying Berkshire Hathaway was his biggest investing mistake.
Even more surprising, he’s not joking.
The Company That Built Buffett’s Fortune
From Textile Mill to Financial Powerhouse
When Buffett first bought Berkshire Hathaway, it was not the investment icon it is today. It was a failing textile company based in New England, struggling to compete with cheaper foreign manufacturing.
Buffett initially bought shares because he believed the stock was undervalued. He later took control of the company, believing he could extract value by running it more efficiently.
That decision eventually gave him a corporate shell he used to build one of the most successful investment vehicles in history.
Today, Berkshire Hathaway owns dozens of businesses outright and holds massive stakes in public companies like Apple, Coca-Cola, and American Express. Its Class A shares trade at prices higher than most people earn in a lifetime.
Buffett’s Enormous Wealth Comes From Berkshire
A Fortune Tied Almost Entirely to One Company
Nearly all of Warren Buffett’s estimated $151 billion net worth comes from his ownership of Berkshire Hathaway Class A shares. That places him around 10th on the Bloomberg Billionaires Index.
But there’s an even more remarkable number hidden in that story.
If Buffett had not spent nearly two decades giving away Berkshire shares to charity, his net worth today would be dramatically higher. The Berkshire Class B shares he has donated since 2006 are now worth roughly $208 billion.
Had he kept them, Buffett would be worth an estimated $359 billion, making him one of the richest people in history by a wide margin.
Despite that staggering success, Buffett insists that the original purchase of Berkshire was a mistake that cost him far more than it made him.
“The Dumbest Stock I Ever Bought”
Buffett’s Brutally Honest Assessment
In a 2010 interview preserved in CNBC’s Warren Buffett Archive, Buffett described Berkshire Hathaway as “the dumbest stock I ever bought.”
That comment shocked many investors. How could the foundation of his empire be his biggest mistake?
Buffett explained that while Berkshire eventually became enormously valuable, the path it took came at a massive opportunity cost.
He didn’t lose money on Berkshire. He lost time, capital, and compounding potential.
The Real Mistake: Buying a Bad Business Cheap
A Lesson Buffett Learned the Hard Way
The core of Buffett’s regret lies in the type of company Berkshire originally was.
Buffett has often said that his early investing style focused too much on buying cheap stocks, even if the underlying businesses were mediocre or declining. Berkshire’s textile operations fell squarely into that category.
The textile business generated modest cash but had little long-term future. Buffett spent years trying to make it work, reinvesting profits and fighting industry decline.
Eventually, the textile operations were shut down entirely.
Buffett later admitted that buying a poor business at a bargain price is often far worse than buying a great business at a fair price.
How Much Did That Mistake Cost?
The Hidden Cost of Missed Compounding
Buffett has estimated that if he had invested the money used to buy Berkshire into higher-quality businesses instead, the difference in long-term returns could have been enormous.
He once suggested that the opportunity cost of owning Berkshire’s textile business in its early years may have cost him hundreds of billions of dollars in lost value over time.
The key issue wasn’t money lost outright. It was money tied up in a low-return business that could have compounded far more effectively elsewhere.
That insight became one of the most important lessons of Buffett’s career.
How the Mistake Changed Buffett’s Investing Philosophy
From Bargain Hunting to Business Quality
Buying Berkshire forced Buffett to rethink how he evaluated investments.
Over time, he shifted away from strict value investing toward a philosophy focused on:
- Strong competitive advantages
- Durable earnings power
- High-quality management
- Long-term growth potential
This evolution was heavily influenced by his longtime partner, Charlie Munger, who encouraged Buffett to prioritize business quality over cheap prices.
That change in mindset led to some of Berkshire’s most successful investments, including Coca-Cola, See’s Candies, and Apple.
Ironically, Buffett’s biggest mistake helped create the investor the world admires today.
Why Berkshire Still Became a Success Anyway
Turning a Bad Start Into a Great Vehicle
Even though Buffett regrets the original purchase, Berkshire eventually became the perfect structure for his investing style.
The company’s insurance businesses, especially GEICO, generated massive amounts of float, money that could be invested before claims were paid. That gave Buffett access to low-cost capital on a scale few investors could match.
Berkshire’s decentralized model allowed Buffett to acquire businesses and let them operate independently, attracting founders who wanted long-term ownership rather than quick exits.
In time, Berkshire stopped being a textile company and became a capital allocation machine.
Buffett’s Final Lesson to Investors
Mistakes Can Be Expensive, Even When You Win
Buffett’s reflection on Berkshire is not about regret in the usual sense. He doesn’t wish Berkshire never existed. Instead, he wants investors to understand how subtle mistakes can carry massive long-term consequences.
His lesson is simple but powerful:
- A good outcome doesn’t mean a good decision
- Opportunity cost matters as much as profit
- Time and compounding are the most valuable assets an investor has
Even the greatest investor of all time made mistakes that shaped his thinking for decades.
As Buffett Nears the End of His CEO Role
A Legacy Defined by Learning
As Warren Buffett prepares to step away from daily leadership at Berkshire Hathaway, his story comes full circle.
The company he once called his dumbest investment became the foundation of his legacy. But the wisdom he gained from that mistake may be even more valuable than the fortune it produced.
Buffett’s career is proof that success doesn’t come from avoiding mistakes entirely. It comes from recognizing them, learning from them, and adjusting course.
That may be his greatest lesson of all.
